Photophysical, DFT and molecular docking studies of Sm(III) and Eu(III) complexes of newly synthesized coumarin ligand

•Synthesis of a newly coumarin ligand and its complexes with Sm(III) and Eu(III) metal ions.•Photophysical and Luminescence results of Sm(III) and Eu(III) complexes exhibit strong red emissions.•Molecular Docking study observes the inhibition activity of coumarin compound toward xanthine oxidase enzyme.•DFT calculations show the optimized structure and separation energies of the coumarin compound.